Eysenck’s Two Big Personality Factors and Their Relationship to Depression in Patients with Chronic Idiopathic Pain Disorder: A Clinimetric Validation Analysis

Table 5

(a)

	Coefficient of homogeneity	Cronbach’s alpha
Extraversion scale E21	0.24	0.85
Extraversion subscale E9	0.39	0.80
Introversion I3	0.39	0.60

Coefficient of homogeneity.
0.30–0.39: just acceptable.
0.40–0.49: acceptable.
0.50 or higher: excellent.
Alpha: 0.80 or higher is excellent [1, 24].

(b)  

𝑁 = 234	Coefficient of homogeneity	Alpha coefficient
Neuroticism scale (N23)	0.34	0.75
N9 (anxiety)	0.32	0.83
N14 (depression)	0.38	0.88